Process of producing heat-insulating material.



J. A. SCHARWATH.

PROCESS OF PRODUCING HEAT INSULATING MATERIAL.

APPLICATION man Aue.2o. 1914.

1, 178,027. Patented Apr. 4, 1916.

A TTORIVEY UNITED STATES PATENT OFFICE.

JOHN ANDREW SGI-IIABW'A'LIHI, 0F ELIZABETH, NEW JERSEY.

PROCESS OF PRODUCTN'G HEAT-INSULATING MATERIAL.

To all whom it may concern:

Be it known thatI, JOHN ASCH-ARWATH, a citizen of the United States, anda resident of Elizabeth, county of Union, andState of New Jersey, have invented certain new and useful Improvements in. Processes of Producing Heat-Insulating Material, of which the following is a specification, reference being had to the accompanying drawings, forming a'part thereof.

-My invention relates to processes of producing heat insulating materials and has special reference to the prdduction of such materials as comprise alkalinesilicates either alone or in combination with other materials as hereinafter described.-

In Patent No. 1,092,402 granted to me April 7th, 1914, on an application filed Octo her 3, 1908, I have set forth and described a process for producing heat insulating materials of the same general character as those produced by my present invention.

One object of my present invention as to produce heat insulating articles of convenient shapes for commercial use by a simple and improved process.

Other objects and advantages of my invention will be set forth hereinafter, and in. order that my invention may be thoroughly understood I will proceed to describe the same in the following specification andthen point out the novel features thereof in appended claims.

Referring to the drawings: Figure 1 of the accompanying drawings is a sectional elevation and Fig. 2 a plan view of. suitable.

apparatus for practising my invention. Flg. 3 1s a transverse section of an artlcle formed by the use of the process of my invention and the apparatus shown in Figs. 1 and 2. A detail 'view of the conveyer cha n and the actuator, for turning the cores 1n the furnaces, is shown in Fig; 4. Fig. '5 is.

an. end view of one of the furnaces of Figs. 1 and 2..

The specific details of the apparatus illustrated' are not essential to my present invention and are merely shown for the pur pose of making the process of my invention perfectly clear. g

A, B and C are a series of heaters or furnaces, each of which is preferably of con-'- siderable length to insure the thorough drying of the coating on the cores.

' Ihbnnted.on-..doub1e sprockets'F and G. The

Specification of Letters Patent.

E is a conveyer or endlessbelt which is sprockets F are mounted on a shaft f which nace is a set of discharge pipes' M which are supplied with a suitable liquid through pipes N from a tank 0, which may be located at a distance from the-furnaces as for example on a higher floor of the building. Each of the discharge pipes M is preferably provided with a large number of small openings or perforations in order that the liquid may be sprayed onto the cores as they pass between the. discharge pipes on the conveyer. The cores Y are preferably hol- 7 low cylinders or pipe sections and have plugs or rods R extending outwardly from their ends. The conveyer chain has a p111 rality of links 0 (see Fig. 4) which are provided with notched or'forked projections c to receive and hold firmly the end rods R of thecores. The end rods B- have a plurality of pins 1" which are spaced apart. circum- Fig. 3, I have found it desirable to employ alarger number of furnaces because each layer is'relatively thin and twenty layers,- for example, may be provided to advantage;

The'operation of the apparatus is as follows: Assuming that the conveyer is in motion, the cores Y are placed on the conveyer as shown in the drawings; .as each core passes between the discharge pipes M which are adjacent to the furnace A, it is coated with ,a heat insulating material -in. liquid form, and immediately afterwardgis carried into th furnace, where the coating is dried andfbal fed. 'Each core is turned by the arm Patented Apr. 4,1916.

Application filed August 20, 1314. Seria1No. 857,667..

Z as it reaches an intermediate point in the furnace to insure that it is uniformly dried and baked. As the c ated cores pass under the discharge'pipe near the furnace B, a,

new coating of liquid is applied, which is in turn dried and baked in the oven B. The

process is repeated at the oven C and for each succeeding oven which may be employed. 1

Any desired number of ovens may be employed, a hollow cylindrical body of heat insulating material being gradually built up on the'core, and each successive layer of the body being individually-dried and baked,

The heat insulating material in liquid form may consist of any of the various grades of silicate of soda or potash, either as single or double silicates. These materials may be used alone or a minor portion of one or more of the following materials may be mixed with the silicates, according to the use for which the heat insulating material is adapted; carbonate of magnesia, oxid of magnesia, infusorial earth, chlorid of calcium or any of the various compounds of metallic and non-metallic elements. The

temperture of the furances may be varied duced, they may be machined or otherwise treated on the exterior to provide a finished surface and may be cut longitudinally in order to prepare them for use as lagging for pipes and for other similar purposes.

By forming the material in layers which are relatively thin and each of which is dried and baked before another layer is applied,

. the finished produce is free from large cavities and blow holes which have been very hard to avoid when the processes hitherto known, were employed.

It may be found of advantage to deposit upon each layer of silicate, some other suitable material before the core is passed into the furnace,'and various details of my improved process may be varied within the spirit and scope of my invention. I therefore intend that only such limitations be imposed as are indicated in the appended claims.

What I claim is:

1. "A process of producing heat'insulating material that consists in alternately coating a core of desired shape withia liquid comprising alkaline silicates and subjecting the coated core to heat of a pre-determined temperature.

2. A process of producing heat insulating material that consists in passing a core of desired shape through a plurality of furnaces and depositing upon the core just before it enters each furnace, a coating of liquid comprising alkaline silicates.

3. A process of producing heat insulating material that consists in alternately subjecting a continuously moving core to a deposit of liquid comprising alkaline silicates and to heat of a pre-determined temperature, sufficient to dry and harden the silicate compound deposited upon it.

4. A process of producing heat insulating material that consists in passing a plurality of cores, having the shape required for the finished product, successively through a plurality of furnaces, and depositing a coating of liquid primarily comprised of alkaline silicates on the cores before they enter each of the furnaces whereby each core is alternately coated with liquid and heated. I

In witness whereof, I have .hereunto set my hand this 19th day bf August 1914, in the presence of two witnesses.

Witnesses r R. J. DEARBORN, F. GRAVES. 

